Patents by Inventor Harish Ramamurthy

Harish Ramamurthy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10681632
    Abstract: A station, a method performed by a station and a corresponding method performed by an access point (AP) of a network to allow the station to operate a wireless local area network (WLAN) radio in a sleep state until the WLAN radio is ready to receive a beacon from the AP. The station includes a low power (LP) radio configured to receive a wake up signal from an AP of a network to which the station is connected. The station further includes a WLAN radio configured to operate in a sleep state until the WLAN radio receives an indication from the LP radio that the wakeup signal has been received, wherein WLAN radio is further configured to operate in a fully awake state after receipt of the indication to receive a beacon from the AP indicating a data transmission is pending for the station.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: June 9, 2020
    Assignee: Apple Inc.
    Inventors: Harish Ramamurthy, Joonsuk Kim, Yong Liu, Christopher Hansen
  • Patent number: 10298386
    Abstract: An unencrypted media access control layer (MAC) protocol data unit (MPDU) having a header is received at a wireless network interface device. The header includes a sequence number. The wireless network interface device uses the sequence number to encrypt data in the unencrypted MPDU to generate an encrypted MPDU, and transmits the encrypted MPDU.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: May 21, 2019
    Assignee: Marvell International Ltd.
    Inventors: Paul A. Lambert, Yong Liu, Raja Banerjea, Harish Ramamurthy
  • Patent number: 10212694
    Abstract: This document describes multicast communication between wireless devices. A scheduling frame may be wirelessly transmitted by a wireless device. The scheduling frame may include a multicast address indicating a group of intended receiving devices for a payload frame. The scheduling frame may further include scheduling information indicating an order for the group of intended receiving devices to transmit acknowledgement information for the payload frame. A payload frame may also be wirelessly transmitted by the wireless device. The payload frame may include payload information intended for the group of intended receiving devices. Additionally, acknowledgement frames may be wirelessly received by the wireless device from at least a subset of the group of intended receiving devices. The acknowledgement frames may be received according to the order indicated in the scheduling information.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: February 19, 2019
    Assignee: Apple Inc.
    Inventors: Harish Ramamurthy, Kapil Chhabra, Matthew L. Semersky, Daniel R. Borges, Charles F. Dominguez
  • Publication number: 20180302854
    Abstract: A station, a method performed by a station and a corresponding method performed by an access point (AP) of a network to allow the station to operate a wireless local area network (WLAN) radio in a sleep state until the WLAN radio is ready to receive a beacon from the AP. The station includes a low power (LP) radio configured to receive a wake up signal from an AP of a network to which the station is connected. The station further includes a WLAN radio configured to operate in a sleep state until the WLAN radio receives an indication from the LP radio that the wakeup signal has been received, wherein WLAN radio is further configured to operate in a fully awake state after receipt of the indication to receive a beacon from the AP indicating a data transmission is pending for the station.
    Type: Application
    Filed: June 20, 2018
    Publication date: October 18, 2018
    Inventors: Harish Ramamurthy, Joonsuk Kim, Yong Liu, Christopher Hansen
  • Patent number: 10070418
    Abstract: The present disclosure includes systems and techniques relating to wireless devices. A described technique includes determining wireless resource allocations (e.g., spatial wireless channel allocations, downlink slot assignments, uplink slot assignments, and frequency sub-band assignments that correspond respectively to frequency sub-bands of a frequency band) in a time domain, a spatial wireless channel domain, and a frequency domain to coordinate communications with wireless devices. The technique further includes generating and transmitting information in one or more frames that directs wireless communications based on the wireless resource allocations.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: September 4, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Raja Banerjea, Hongyuan Zhang, Harish Ramamurthy
  • Patent number: 10056986
    Abstract: A first network device including first and second transceiver modules. The first transceiver module: during a first downlink period, transmits an uplink indication (UI) signal; and during an uplink period and subsequent to transmitting the UI signal, transmits a first data signal. The UI signal indicates when the first data signal is transmitted. The second transceiver module, prior to transmission of the UI signal, transmits a notice signal that indicates to a second network device not to transmit data to the second transceiver module during a second downlink period. The second downlink period is subsequent to an unused portion of the uplink period. The second transceiver module: transitions to a power save mode prior to transmission of the first data signal; and transmits a second data signal from the first network device based on the UI signal, subsequent to transmission of the first data signal, and during the unused portion.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: August 21, 2018
    Assignee: Marvell International Ltd.
    Inventors: Josselin de la Broise, Raja Banerjea, Harish Ramamurthy
  • Patent number: 10015741
    Abstract: A station, a method performed by a station and a corresponding method performed by an access point (AP) of a network to allow the station to operate a wireless local area network (WLAN) radio in a sleep state until the WLAN radio is ready to receive a beacon from the AP. The station includes a low power (LP) radio configured to receive a wake up signal from an AP of a network to which the station is connected. The station further includes a WLAN radio configured to operate in a sleep state until the WLAN radio receives an indication from the LP radio that the wakeup signal has been received, wherein WLAN radio is further configured to operate in a fully awake state after receipt of the indication to receive a beacon from the AP indicating a data transmission is pending for the station.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: July 3, 2018
    Assignee: APPLE INC.
    Inventors: Harish Ramamurthy, Joonsuk Kim, Yong Liu, Christopher Hansen
  • Patent number: 9992772
    Abstract: A network interface device generates a packet that includes a beacon frame for transmission in a superframe. The beacon frame is used to announce the presence of a network and also is formatted as a beamforming training (BFT) frame to permit other communication devices to perform beamforming training with the packet. The beacon frame is generated to include (i) a frame control field, (ii) a duration field, (iii) a timestamp field, (iv) information indicative of a time of a subsequent association beamforming training (A-BFT) time slot, and (v) beamforming training information, which includes a countdown field. The network interface device transmits the packet during a beacon timeslot of the superframe, which is separate from an association beamforming training (A-BFT) timeslot of the superframe.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: June 5, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Hongyuan Zhang, Raja Banerjea, Harish Ramamurthy, Hui-Ling Lou
  • Patent number: 9883522
    Abstract: Systems and techniques relating to wireless communications are described. A described technique includes determining a primary access category for a transmission opportunity (TXOP) to transmit data to a primary wireless communication device based on a first back-off timer associated with the primary access category; determining a secondary access category for the TXOP to transmit data to a secondary wireless communication device; and transmitting, during the TXOP, spatially steered streams that concurrently provide separate data to respective devices comprising the primary and the secondary device.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: January 30, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Raja Banerjea, Harish Ramamurthy
  • Patent number: 9832057
    Abstract: In a method for transmitting a data unit in a wireless communication network, a physical layer (PHY) preamble and a media access control layer (MAC) header are generated. In generating the MAC header, a first address field to include a first address and a second address field to include a second address are generated. The first, not globally unique, address indicates a communication device for which the data unit is intended or a communication device that is transmitting the data unit. The second address field indicates the other one of a communication device for which the data unit is intended or a communication device that is transmitting the data unit. The first address field and the second address field are included in the MAC header. The MAC header omits a globally unique address corresponding to the first address of the first address field.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: November 28, 2017
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Harish Ramamurthy, Hongyuan Zhang
  • Publication number: 20170280421
    Abstract: This document describes multicast communication between wireless devices. A scheduling frame may be wirelessly transmitted by a wireless device. The scheduling frame may include a multicast address indicating a group of intended receiving devices for a payload frame. The scheduling frame may further include scheduling information indicating an order for the group of intended receiving devices to transmit acknowledgement information for the payload frame. A payload frame may also be wirelessly transmitted by the wireless device. The payload frame may include payload information intended for the group of intended receiving devices. Additionally, acknowledgement frames may be wirelessly received by the wireless device from at least a subset of the group of intended receiving devices. The acknowledgement frames may be received according to the order indicated in the scheduling information.
    Type: Application
    Filed: June 9, 2017
    Publication date: September 28, 2017
    Inventors: Harish Ramamurthy, Kapil Chhabra, Matthew L. Semersky, Daniel R. Borges, Charles F. Dominguez
  • Patent number: 9769071
    Abstract: A first communication device transmits one or more first communication frames during a transmit opportunity period (TXOP) of the first communication device via a first composite channel. A control frame is generated, wherein the control frame includes information indicating a bandwidth of the first composite channel. After the one or more first communication frames have been transmitted, the first communication device transmits, during the TXOP, the control frame via the first composite channel. Information from a response frame that indicates a bandwidth of a second composite communication channel is extracted, the response frame having been transmitted by a second communication device and received by the first communication device during the TXOP. The first communication device transmits one or more second communication frames during the TXOP, wherein the one or more communication frames span the second composite communication channel and do not span the entire first composite communication channel.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: September 19, 2017
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Harish Ramamurthy, Raja Banerjea
  • Patent number: 9736731
    Abstract: A desired number of buffers to be used in a block acknowledgment (BA) session or with media access control (MAC) data units having a same traffic identifier (TID) is determined. A desired maximum MAC data unit size to be used in the BA session or with the MAC data units having the same TID is determined. An indication of the desired number of buffers in the BA session or with the MAC data units having the same TID is transmitted to a communication device in a wireless communication network for negotiating with the communication device. An indication of the desired maximum MAC data unit size to be used in the BA session or with the MAC data units having the same TID is transmitted to the second communication device for negotiating with the other station.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: August 15, 2017
    Assignee: Marvell International Ltd.
    Inventors: Yong Liu, Raja Banerjea, Hongyuan Zhang, Harish Ramamurthy
  • Patent number: 9680563
    Abstract: A system and method for partial bandwidth communication. The system includes a device that has a transceiver configured to connect to a network, a memory storing an executable program and a processor. The program causes the processor to perform operations including receiving data to be transmitted to second device, determining if the data uses less than a predetermined bandwidth used as a unit for a carrier aggregation, determining a plurality of sub-bands in the predetermined bandwidth, each sub-band including at least one pilot and a plurality of frequency tones, receiving network information from the second device, the network information indicating a preferred sub-band of the sub-bands, assigning one of the sub-bands to the second device based upon the network information, generating a packet including an indication, the indication indicating the assigned sub-band; transmitting the packet to the second device and transmitting the data in the assigned sub-band.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: June 13, 2017
    Assignee: APPLE INC.
    Inventors: Joonsuk Kim, Yong Liu, Christopher Hansen, Harish Ramamurthy
  • Patent number: 9681418
    Abstract: This document describes multicast communication between wireless devices. A scheduling frame may be wirelessly transmitted by a wireless device. The scheduling frame may include a multicast address indicating a group of intended receiving devices for a payload frame. The scheduling frame may further include scheduling information indicating an order for the group of intended receiving devices to transmit acknowledgement information for the payload frame. A payload frame may also be wirelessly transmitted by the wireless device. The payload frame may include payload information intended for the group of intended receiving devices. Additionally, acknowledgement frames may be wirelessly received by the wireless device from at least a subset of the group of intended receiving devices. The acknowledgement frames may be received according to the order indicated in the scheduling information.
    Type: Grant
    Filed: November 25, 2013
    Date of Patent: June 13, 2017
    Assignee: Apple Inc.
    Inventors: Harish Ramamurthy, Kapil Chhabra, Matthew L. Semersky, Daniel R. Borges, Charles F. Dominguez
  • Patent number: 9661647
    Abstract: Systems and technique for wireless communication are described. A describe technique includes transmitting, from a first device, a request to send (RTS) to the second devices to protect a wireless communication neighborhood of the first device and wireless communication neighborhood of the second devices for transmission of a multi-user frame; receiving clear to send (CTS) responses from the second devices; determining a bandwidth width for the multi-user frame based on a bandwidth availability among the second devices as indicated by the CTS responses and bandwidth indications included in the CTS responses, the multi-user frame comprising spatially steered data frames that are respectively intended for the second devices and are in accordance with the determined bandwidth width; and transmitting the multi-user frame to the identified devices in accordance with the determined bandwidth width.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: May 23, 2017
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Raja Banerjea, Harish Ramamurthy
  • Patent number: 9578682
    Abstract: A device including a first transceiver configured to transmit and receive, using a first antenna, according to a first communication protocol, a second transceiver configured to transmit and receive, using a second antenna, according to the first communication protocol, and a third transceiver configured to transmit and receive, using the second antenna, according to a second communication protocol. A controller is configured to select between a first mode where the first, second, and third transceivers are configured to respectively communicate using the first and second antennas at a same time, and a second mode where the first, second, and third transceivers are configured to respectively communicate using the first and second antennas at different times. In the first mode and the second mode, the controller is further configured to selectively allow the second transceiver to transmit and receive using the second antenna at a same time as the third transceiver.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: February 21, 2017
    Assignee: Marvell International Ltd.
    Inventors: Harish Ramamurthy, Todd Steven Wheeler, Brian Bosso, Atul Salhotra, Ken Yeung
  • Patent number: 9532243
    Abstract: A wireless local area network (WLAN) device processes received samples for a radio frequency channel in an unlicensed radio frequency band to detect radio frequency interference from a long term evolution (LTE) wireless communication system. The WLAN device performs a correlation of received time-domain samples to detect the presence of a cyclic prefix for an orthogonal frequency division multiplexing (OFDM) symbol used by the LTE wireless communication system. The WLAN device searches for cross-correlation peaks (1) that exceed a peak power threshold value, (2) that a ratio of which exceed a ratio threshold, and (3) that are separated by a time period corresponding to the OFDM symbol. The WLAN device detects the presence of the LTE wireless communication system without decoding the OFDM symbols.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: December 27, 2016
    Assignee: Apple Inc.
    Inventors: Joonsuk Kim, Yong Liu, Harish Ramamurthy
  • Patent number: 9521581
    Abstract: Systems and techniques relating to wireless communications are described. A described technique includes generating a physical frame, the physical frame including (i) spatially steered length fields and (ii) spatially steered frames that respectively include aggregated medium access control data units (A-MPDUs) that encapsulate data, the steered length fields respectively indicating lengths of the A-MPDUs in number of four-octet units. Generating the physical frame can include including after an A-MPDU of the A-MPDUs in a steered frame of the steered frames, (i) a medium access control layer pad and (ii) a physical layer pad. A length of the medium access control layer pad and a length of the physical layer pad can be based on the physical frame.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: December 13, 2016
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Harish Ramamurthy, Ken Kinwah Ho, Raja Banerjea, Hongyuan Zhang
  • Patent number: 9516667
    Abstract: The present disclosure includes systems and techniques relating to wireless communications. A described technique, for example, includes transmitting a multi-user frame, in a frequency band, that concurrently provides data via spatially steered streams to a group of wireless communication devices; monitoring for acknowledgements, in the frequency band, to respective portions of the multi-user frame; detecting a lack of reception of an expected acknowledgement from a first device of the wireless communication devices; and transmitting, based on the lack of reception of the expected acknowledgement, a signal in the frequency band to prevent a transmission from a wireless communication device that is separate from the group of wireless communication devices, and to control transmission of an acknowledgement from a second device of the wireless communication devices.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: December 6, 2016
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Raja Banerjea, Harish Ramamurthy, Hongyuan Zhang